The weather in Ha Long Bay in September is very hot. The average temperatures are between 78°F and 89°F, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Ha Long Bay. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Ha Long Bay in September 2025.
If you’re planning to visit Ha Long Bay in the near future, we highly recommend that you review the 14 day weather forecast for Ha Long Bay before you arrive.
Temperatures
89° / 78°
Rainy Days
11
Snowy Days
0
Dry Days
19
Rainfall
10.79
in
Sun Hours
10.7
Hrs
